If the cover will come completely off, look at the inside of it to make sure the bracket that holds it in place is not broken. If it's not broken...

Grab a flashlight

Remove the stitch lid - there are little silver clips at the base
of the lid on either side - push the lid either to the left or right
against these clips and you'll be able to pop it right off. You will reverse
procedure to put it back on. Removing the lid isn't absolutely necessary but does make it easier to see/access screw.

Raise the handle of the machine

Aim your flashlight into the machine behind the left side of the handle... you should be able to see down inside the machine to the set-screw that holds the side cover in place

Check to see what kind of screwdriver you need - either a Phillips head or a Torx Driver. Most of the newer Pfaff models require a Torx Driver (this is a star-shaped screw-driver available at most hardware stores - Size T25 should fit this particular screw)

Slide cover back into place - may need to wiggle it a bit to get the bracket under the screw

Tighten screw & you should be back in business

If the bracket on the inside of the cover is broken, this part will need to be replaced. Pfaff parts are only available through an authorized Pfaff dealer so your local dealer will need to order it for you.

Hope this helps - please don't hesitate to respond if you need further help or clarification.

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Related Questions:

If the upper thread is looping on the bottom of the fabric as you sew, the upper tension is too loose. It could be threaded incorrectly, the upper thread may not be seated in the tension disk properly (be sure to RAISE the presser foot BEFORE threading the upper thread), or the upper thread tension is set too loose.

If you have checked everything and it is still looping underneath, the bobbin tension may be too loose or the bobbincase needs replacement.

THE BOTTOM AND TOP THREADS ARE IN A TUG OF WAR. WHEN THE TOP IS TOO LOOSE THE BOBBIN WILL BE PULLING HARDER THAN THE TOP THREAD SO A GREAT DEAL MORE THREAD WILL END UP ON THE BOTTOM. TO CORRECT THIS YOU INCREASE THE TOP THREAD TENSION. IF THE TOP THREAD IS PULLING HARDER THAN THE BOTTOM THEN A GREAT DEAL MORE BOBBIN THREAD WILL END UP ON THE TOP. TO CORRECT THIS YOU WOULD LOWER THE TENSION ON TOP.

Flip the presser switch up to raise the presser foot. Turn the hand wheel counterclockwise until the needle is in its highest position.

2Hold the hand wheel in place with your left hand while turning the hand wheel knob counterclockwise with your right hand to loosen the hand wheel knob.

3Place the desired spool of thread on the spool pin so that the pin fits all the way through the hole in the center of the spool. Put the spool holder onto the end of the spool pin that is sticking through the spool of thread and press firmly to ensure that the spool holder keeps the spool in place.

4Grasp the end of the thread and hold it taut between the thumb and index fingers of both hands. Snap the taut section of thread into the thread guide post located to the left of the spool pin.

5Pull the end of the thread gently. Wrap the thread around the bobbin winder tension disk near the left front on top of the machine, starting at the side of the tension disk facing you and wrapping around in a clockwise direction.

6Poke the end of the thread through the small hole in the bobbin from the inside out so that the loose end of the thread sticks through the top of the bobbin. Put the bobbin on the spindle, or bobbin winder, and gently slide the bobbin winder to the right.

7Hold the loose end of the thread in place while pressing down on the foot pedal to start the machine. Hold the foot pedal down until the bobbin is as full as desired. The machine will automatically stop once the bobbin has reached capacity.

8Cut the loose end of the thread using scissors. Slide the bobbin winder to the left and remove the bobbin. Hold the hand wheel in your left hand and tighten the hand wheel knob with your right hand by turning it clockwise

When you thread your bobbin in the bobbin case, hold it only by the thread. If the bobbin and bobbin case fall, the tension is too loose. If this is the case, turn the bobbin tension screw 1/4 turn until the bobbin and bobbin case do not fall when only holding by the thread. The top tension should be set between 4 and 5. The best way to see which one needs to be adjusted is to do a zigzag. If the thread is pulling more on top and your top tension is set between 4 and 5, the bobbin tension is too loose. If your top tension is set between 4 and 5 and it's pulling on the bottom, the bottom is too tight.

Step 1. Set the upper tension tighter by turning the dial slightly to the right, or looser by turning the dial slightly to the left. (Or by using the electronic control if the sewing machine has one.) This adjusts the tightness of the main thread.Step 2. Set the lower tension slightly tighter or looser using the dial or electronic control. This adjusts the tightness of the bobbin thread.Step 3. Cut a small scrap of fabric, preferably the same type you want to sew with.Step 4. Sew a few test stitches on the scrap. Examine the stitches to see if they’re too tight or too loose. The stitches should lie flat against the fabric, without pulling the fabric or making loops that stick out.Step 5. Repeat Step 1 to Step 4 again as needed.